Change "football" for round cover?
Road Warrior
Joined: Jan 2007
Posts: 1,296
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From: canada
Road Master
Joined: Jan 2008
Posts: 874
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From: Southern Arizona
Thread Starter
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Road Master
Joined: Jul 2010
Posts: 1,241
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But, Exactly how is this done when all the round covers in the Harlley Big Book say the go with the SE air filter and the ECM has to be calibrated if you use SE air filter, as far as I can tell? Sorry to be dense, but I'm puzzled and brand new to this. I don't want to change stock settings. I really appreciate the help from you all. Thanks
But, Exactly how is this done when all the round covers in the Harlley Big Book say the go with the SE air filter and the ECM has to be calibrated if you use SE air filter, as far as I can tell? Sorry to be dense, but I'm puzzled and brand new to this. I don't want to change stock settings. I really appreciate the help from you all. Thanks
Road Warrior
Joined: Jun 2008
Posts: 1,602
Likes: 3
From: Southeastern Michigan
But, Exactly how is this done when all the round covers in the Harlley Big Book say the go with the SE air filter and the ECM has to be calibrated if you use SE air filter, as far as I can tell? Sorry to be dense, but I'm puzzled and brand new to this. I don't want to change stock settings. I really appreciate the help from you all. Thanks
Simple: Your cylinder is capable of as much volume as it can take in through the intake, and push out through the exhaust. Both are limited from the factory (for various reasons) of the cylinder's potential. If you only change the efficiency of one (intake or exhaust) the other will be the limiting factor, and nothing changes. The cylinder can't pull in or push out more then the lesser will allow. No fuel adjustments are necessary.
A Stage I opens both (intake and exhaust), allowing for more air flow through the engine. In order to take advantage of that added airflow more fuel is required, otherwise a lean air/fuel ratio will occur, limiting, and in most cases decreasing, it's power potential. By adding more fuel at this point, you add more fuel burn per stroke, adding extra power capability to the unrestricted engine.
Next lesson: Bore and stroke... JK!!!!
BTW - the round cover looks better by far!
Last edited by Scorpion07; Aug 5, 2010 at 02:35 PM.
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Seasoned HDF Member
Joined: Sep 2007
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From: Danbury CT
I just happen to have the one pictured below on the Heritage in the classies 
You will need a new backing plate & round filter which will most likely be a hi flow so no you'll need a tuner. Then the pipes will follow so the $30 cover will cost you a grand
You will need a new backing plate & round filter which will most likely be a hi flow so no you'll need a tuner. Then the pipes will follow so the $30 cover will cost you a grand
Last edited by golfblues; Aug 5, 2010 at 08:52 PM.